Alphabet Song, been around since at least 1761. I noticed with this song, turning it all into pure tones has a lot of problems.
There is a part in this song that says 'l m n o p' quickly in a high pitch. It's a eigth note. But as they are full sine waves it is too large to do quick pulses. So I made them half notes, and now it sounds too high but if I drop the the notes it is too low.
